CN104817213A - Heavy metal wastewater treatment process in electroplating and special device thereof - Google Patents

Heavy metal wastewater treatment process in electroplating and special device thereof Download PDF

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Publication number
CN104817213A
CN104817213A CN201510179498.7A CN201510179498A CN104817213A CN 104817213 A CN104817213 A CN 104817213A CN 201510179498 A CN201510179498 A CN 201510179498A CN 104817213 A CN104817213 A CN 104817213A
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CN
China
Prior art keywords
waste water
ion exchange
resin
output terminal
exchange column
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CN201510179498.7A
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Chinese (zh)
Inventor
潘文刚
夏俊方
张水水
胡君杰
方小琴
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上海晶宇环境工程有限公司
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Priority to CN201510179498.7A priority Critical patent/CN104817213A/en
Publication of CN104817213A publication Critical patent/CN104817213A/en

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Abstract

The invention relates to a heavy metal wastewater treatment process in electroplating and a special device thereof. A two-stage series-connection resin method is utilized in the heavy metal wastewater treatment process in electroplating and the special device, thus heavy metal wastewater in electroplating reaches a high discharge standard and metal nickel in the electroplating wastewater is recycled.

Description

Electroplated heavy metals waste water treatment process and special purpose device thereof
Technical field
The invention belongs to environmental protection industry (epi) industrial waste water treatment, specifically just relate to electroplating wastewater processing field, especially relating to one utilizes two-stage series connection resin method to carry out electroplated heavy metals waste water treatment process and special purpose device thereof, not only make electroplated heavy metals waste water reach high standard discharge, also make the metallic nickel in electroplating wastewater recycle.
Background technology
Along with the raising of people's living standard, durable consumer goods high number increases, and the production process of durable consumer goods needs to use plating.Therefore, since 20th century, galvanizer obtained fast development already.Electroplating technology be a kind of make plating piece surface obtain needed for the advanced method of metal plating, can make metal plating have flat smooth good appearance and with matrix mortise.But, before plating, the dirt on plating piece surface (oil, rust, iron scale etc.) thoroughly must be cleaned out in Electroplating Production, meanwhile, in electroplating process and plating terminate after also need repeatedly to clean plating piece with water.Therefore, a large amount of electroplating wastewaters will inevitably be produced in plating production process, except containing except the highly toxic substances such as prussiate, complicated complex salt in this waste water, also extensively containing heavy metals such as copper, nickel, chromium, zinc.Wherein, heavy metal generally has carcinogenic, teratogenesis and mutagenic character, very big to harm, and the dispersion face of Electroplate Factory is comparatively wide, compared with other industry, although wastewater flow rate is relatively less, but contamination area is relatively large, the pollution caused is very serious.Therefore, carry out Electroplating Wastewater Treatment technology, reduce heavy metal contamination harm, it is the problem of industry member and environmental administration's primary study always, and be more and more subject to the most attention of industry member, the separation of heavy metal ion and recovery technology, have a wide range of applications in modern science and technology and industrial circle.
The treatment process of electroplating wastewater mainly contains: chemical precipitation method, absorption method, ion exchange method etc., consider from the angle of environment protection, the process of heavy metal out of electroplating wastewater in the past mainly concentrates on removes toxic heavy metal, traditional can not recycle with the water after precipitator method process, and the toxic pollutant disposal costs produced is higher; Use absorption method process, only better to certain density water treatment effect, and loading capacity is limited, water outlet is difficult to reach standard, and sorbent material not easily regenerates.Comparatively speaking, ion exchange method is the effect by ion exchange column, by the H of the positively charged ion in water and the negatively charged ion in water and the positive resin in exchange column +with the OH of negative resin -exchange, thus reach the object of desalination, can remove the toxic metallic contaminants in waste water selectively, reclaim the precious metal in waste water, and make water circulation use, the rate of recovery reaches more than 97%.After but heavy metal content acquires a certain degree in the water outlet after existing ion exchange method process, cannot reduce further again, high standard discharge can not be reached, and just simple heavy metal in electroplating wastewater to be separated, cannot effectively utilize,
Summary of the invention
The object of the invention is after the water outlet heavy metal content after for the process of existing electroplating wastewater ion exchange process acquires a certain degree, cannot reduce further again, high standard discharge can not be reached, and just simple by the nickel metal separation in electroplating wastewater out, the technological deficiency effectively utilized cannot be carried out, a kind of electroplated heavy metals waste water treatment process and special purpose device thereof are provided, two-stage series connection resin method is utilized to carry out electroplated heavy metals waste water treatment process and special purpose device thereof, electroplated heavy metals waste water is not only made to reach high standard discharge, the heavy metal nickel in electroplating wastewater is also made to recycle.
Technical scheme
In order to realize above-mentioned technical purpose, the present invention designs a kind of electroplated heavy metals waste water treatment process, it is characterized in that, it comprises following step:
(1) electroplated heavy metals waste water is sent into pretreatment system, carry out precipitin reaction, be precipitated water outlet;
(2) one-level resin system is sent in precipitation water outlet step (1) obtained, and carries out ion-exchange, removes the heavy metal in waste water, obtains a grade resins water outlet;
(3) second resin system is sent in grade resins water outlet step (2) obtained, and carries out ion-exchange, removes the heavy metal in waste water further, obtains second resin water outlet;
(4) step (2) and (3) ion exchange resin saturated after, add regenerated liquid and regenerate, nickel recovery system sent into by the elutriant that obtains, carries out electrolytic recovery nickel.
Further, before the precipitin reaction of described step (1) is carried out, first regulate waste water ph in the scope of 8-9.5, redox potential value, between-160 ~ 100mV, then adds the Na of 1-3% 2s solution carries out precipitin reaction, after reacting completely, then add polymerize aluminum chloride, polyacrylamide value carries out coagulating sedimentation, primary ion exchange resin system sent into by gained supernatant liquor.
Further, described step (2) and step (3) intermediate ion clearing house resin column are resin, by the scope of wastewater streams speed control built in 20-35m/h, pass through Na +the effect of type resin, by the heavy metal ion in waste water and Na +exchange, remove the heavy metal in waste water.
Further, the second resin standard water discharge discharge of described step (3).
Further, the resin regeneration process of described step (4) first adopts concentration to be that the HCl solution of 3%-7% regenerates, heavy metal is exchanged, then the NaOH solution of same concentrations is adopted to make the transition, nickel recovery system sent into by the elutriant that the nickel content produced is high, carry out electrolytic recovery nickel, waste liquid returns former fill cycle reprocessing.
For the special purpose device of the electroplated heavy metals waste water treatment process described in above-mentioned any one claim, it is characterized in that: it comprises pre-processing device, primary ion exchange column, secondary ion exchange column, nickel recovery system;
Former pond is connected with pre-processing device, the first intake pump connecting pipeline is equipped with, the clear liquid output terminal of pre-processing device connects primary ion exchange column, mud output terminal connects sludge treating system, the filtrate output terminal of sludge treating system connects go back to former pond, the output terminal of regenerated liquid case is connected with primary ion exchange column and secondary ion exchange column respectively, the second intake pump connecting pipeline is equipped with, the clear liquid output terminal of primary ion exchange column connects secondary ion exchange column, elutriant output terminal connects nickel recovery system, the clear liquid output terminal of secondary ion exchange column connects product pond, elutriant output terminal connects nickel and reclaims system, the output terminal of nickel recovery system connects nickel returnable, waste liquid output terminal connects go back to former pond.
Further, described pre-processing device is configured with stirrer, dosing pump, in-line meter.
Further, described primary ion exchange column and secondary ion exchange column can secondarys each other, and all ion exchange resin are housed, and connecting pipeline is all equipped with under meter, tensimeter.
Further, in described nickel recovery system, be provided with anolyte compartment, cathode compartment, and insoluble positive electrode and recovery negative electrode are housed.
Beneficial effect
A kind of electroplated heavy metals waste water treatment process of the present invention's design and special purpose device thereof, two-stage series connection resin method is utilized to carry out electroplated heavy metals waste water treatment process and special purpose device thereof, not only make electroplated heavy metals waste water reach high standard discharge, also make the metallic nickel in electroplating wastewater recycle.
Accompanying drawing explanation
Accompanying drawing 1 is process flow sheet of the present invention.
Accompanying drawing 2 is special purpose device annexation schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
Embodiment
As shown in Figure 2, the special purpose device of electroplated heavy metals waste water treatment process, comprises pre-processing device 1, primary ion exchange column 2, secondary ion exchange column 3, nickel recovery system 4;
Former pond 5 is connected with pre-processing device 1, the first intake pump 6 connecting pipeline is equipped with, the clear liquid output terminal of pre-processing device 1 connects primary ion exchange column 2, mud output terminal connects sludge treating system 8, the filtrate output terminal of sludge treating system 8 connects go back to former pond 5, the output terminal of regenerated liquid case 9 is connected with primary ion exchange column 2 and secondary ion exchange column 3 respectively, the second intake pump 10 connecting pipeline is equipped with, the clear liquid output terminal of primary ion exchange column 2 connects secondary ion exchange column 3, elutriant output terminal connects nickel recovery system 4, the clear liquid output terminal of secondary ion exchange column 3 connects product pond 11, elutriant output terminal connects nickel recovery system 4, the output terminal of nickel recovery system 4 connects nickel returnable 14, waste liquid output terminal connects go back to former pond 5.
Described pre-processing device 1 is configured with stirrer 7, dosing pump, in-line meter.
Described primary ion exchange column 2 and secondary ion exchange column 3 can secondarys each other, and all ion exchange resin are housed, and connecting pipeline is all equipped with under meter, tensimeter.
Be provided with anolyte compartment, cathode compartment in described nickel recovery system 4, and insoluble positive electrode 12 and recovery negative electrode 13 are housed.
As shown in Figure 1, utilize said apparatus to carry out the technique of electroplated heavy metals wastewater treatment, it comprises following step:
The first step: electroplated heavy metals waste water is pumped into pretreatment system 1, regulate waste water ph to 8 ~ 9.5, redox potential value is between-160 ~ 100mV, then adds the Na of (1 ~ 3) % 2s solution carries out precipitin reaction, after reacting completely, add polymerize aluminum chloride again, polyacrylamide carries out coagulating sedimentation and be precipitated water outlet, heavy metal is made to enter sludge treating system with sludge form, to alleviate follow-up resin burden, wherein, mud mud cake outward transport after treatment, filtrate returns fill cycle process;
Second step: primary ion exchange column 2 is sent in the precipitation water outlet the first step obtained, adopts resin, controls waste water flow velocity in the scope of (20 ~ 35) m/h, at Na by under meter +under the effect of type resin, the heavy metal ion in waste water and Na +exchange, thus remove the heavy metal in water, water outlet enters secondary ion exchange column 3;
3rd step: secondary ion exchange column 3 adopts different resin, controls waste water flow velocity in the scope of (20 ~ 35) m/h, at Na by under meter +under the effect of type resin, the heavy metal ion in waste water and Na +exchange further, thus remove the heavy metal in water further, water outlet enters after-treatment system;
4th step: second resin standard water discharge is discharged;
5th step: after primary ion exchange resin column 2 and secondary ion exchange resin column 3 are saturated, add concentration be 3% ~ 7% HCl solution regenerate, heavy metal is exchanged, then make the transition by the NaOH solution of same concentrations, the elutriant that the nickel content that this process produces is high enters nickel recovery system, carry out electrolytic recovery nickel, the waste liquid of generation returns former fill cycle process.
The present invention adopt pre-treatment, one-level plastic resin treatment, second resin process, electrolysis process electroplated heavy metals waste water is processed, final outflow water is stablized and reaches emission standard, and decrease consumption of chemical agent, investment running cost reduces greatly, not only solve the difficult problem that current heavy metal wastewater thereby is difficult to reach high standard discharge, and reclaimed nickel, there is good environmental benefit and economic benefit.

Claims (9)

1. an electroplated heavy metals waste water treatment process, is characterized in that, it comprises following step:
(1) electroplated heavy metals waste water is sent into pretreatment system, carry out precipitin reaction, be precipitated water outlet;
(2) one-level resin system is sent in precipitation water outlet step (1) obtained, and carries out ion-exchange, removes the heavy metal in waste water, obtains a grade resins water outlet;
(3) second resin system is sent in grade resins water outlet step (2) obtained, and carries out ion-exchange, removes the heavy metal in waste water further, obtains second resin water outlet;
(4) by step (2) and (3) ion exchange column saturated after, add regenerated liquid and regenerate, nickel recovery system sent into by the elutriant that obtains, carries out electrolytic recovery nickel.
2. a kind of electroplated heavy metals waste water treatment process as claimed in claim 1, it is characterized in that: before the precipitin reaction of described step (1) is carried out, first regulate waste water ph in the scope of 8-9.5, redox potential value, between-160 ~ 100mV, then adds the Na of 1-3% 2s solution carries out precipitin reaction, after reacting completely, then add polymerize aluminum chloride, polyacrylamide value carries out coagulating sedimentation, primary ion exchange resin system sent into by gained supernatant liquor.
3. a kind of electroplated heavy metals waste water treatment process as claimed in claim 1, it is characterized in that: described step (2) and step (3) intermediate ion clearing house resin column are resin, by the scope of wastewater streams speed control built in 20-35m/h, pass through Na +the effect of type resin, by the heavy metal ion in waste water and Na +exchange, remove the heavy metal in waste water.
4. a kind of electroplated heavy metals waste water treatment process as claimed in claim 1, is characterized in that: the second resin standard water discharge discharge of described step (3).
5. a kind of electroplated heavy metals waste water treatment process as claimed in claim 1, it is characterized in that: the resin regeneration process of described step (4) first adopts concentration to be that the HCl solution of 3%-7% regenerates, heavy metal is exchanged, then the NaOH solution of same concentrations is adopted to make the transition, nickel recovery system sent into by the elutriant that the nickel content produced is high, carry out electrolytic recovery nickel, waste liquid returns former fill cycle reprocessing.
6. for the special purpose device of the electroplated heavy metals waste water treatment process described in above-mentioned any one claim, it is characterized in that: it comprises pre-processing device (1), primary ion exchange column (2), secondary ion exchange column (3), nickel recovery system (4);
Former pond (5) is connected with pre-processing device (1), the first intake pump (6) connecting pipeline is equipped with, the clear liquid output terminal of pre-processing device (1) connects primary ion exchange column (2), mud output terminal connects sludge treating system (8), the filtrate output terminal of sludge treating system (8) connects go back to former pond (5), the output terminal of regenerated liquid case (9) is connected with primary ion exchange column (2) and secondary ion exchange column (3) respectively, the second intake pump (10) connecting pipeline is equipped with, the clear liquid output terminal of primary ion exchange column (2) connects secondary ion exchange column (3), elutriant output terminal connects nickel recovery system (4), the clear liquid output terminal of secondary ion exchange column (3) connects product pond (11), elutriant output terminal connects nickel recovery system (4), the output terminal of nickel recovery system (4) connects nickel returnable (14), waste liquid output terminal connects go back to former pond (5).
7. the special purpose device of electroplated heavy metals waste water treatment process as claimed in claim 6, is characterized in that: described pre-processing device (1) is configured with stirrer (7), dosing pump, in-line meter.
8. the special purpose device of electroplated heavy metals waste water treatment process as claimed in claim 6, it is characterized in that: described primary ion exchange column (2) and secondary ion exchange column (3) can secondarys each other, and all ion exchange resin is housed, connecting pipeline is all equipped with under meter, tensimeter.
9. the special purpose device of electroplated heavy metals waste water treatment process as claimed in claim 6, it is characterized in that: in described nickel recovery system (4), be provided with anolyte compartment, cathode compartment, and insoluble positive electrode (12) and recovery negative electrode (13) are housed.
CN201510179498.7A 2015-04-15 2015-04-15 Heavy metal wastewater treatment process in electroplating and special device thereof CN104817213A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105463555A (en) * 2015-12-09 2016-04-06 无锡市晨源建筑器材有限公司 Electroplating bath equipment with electroplating effluent treatment device
CN107555571A (en) * 2017-08-25 2018-01-09 徐云丽 The environment-friendly treating process of heavy metal wastewater thereby
CN108147580A (en) * 2017-12-18 2018-06-12 五邑大学 A kind of nickeliferous wire board plating wastewater processing system of cupric and method
CN108264164A (en) * 2018-01-15 2018-07-10 湖南永清环保研究院有限责任公司 A kind of nickel-containing wastewater treatment technology

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203959966U (en) * 2014-07-09 2014-11-26 东莞市金粟环境科技有限公司 Move back nickel liquid retrieving arrangement
CN104261526A (en) * 2014-09-17 2015-01-07 哈尔滨工业大学深圳研究生院 Treatment method of heavy metal wastewater

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203959966U (en) * 2014-07-09 2014-11-26 东莞市金粟环境科技有限公司 Move back nickel liquid retrieving arrangement
CN104261526A (en) * 2014-09-17 2015-01-07 哈尔滨工业大学深圳研究生院 Treatment method of heavy metal wastewater

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105463555A (en) * 2015-12-09 2016-04-06 无锡市晨源建筑器材有限公司 Electroplating bath equipment with electroplating effluent treatment device
CN107555571A (en) * 2017-08-25 2018-01-09 徐云丽 The environment-friendly treating process of heavy metal wastewater thereby
CN108147580A (en) * 2017-12-18 2018-06-12 五邑大学 A kind of nickeliferous wire board plating wastewater processing system of cupric and method
CN108264164A (en) * 2018-01-15 2018-07-10 湖南永清环保研究院有限责任公司 A kind of nickel-containing wastewater treatment technology

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Application publication date: 20150805